From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Thu, 3 May 2001 18:32:59 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Thu, 3 May 2001 18:32:50 -0400 Received: from domino1.resilience.com ([209.245.157.33]:18832 "EHLO intranet.resilience.com") by vger.kernel.org with ESMTP id ; Thu, 3 May 2001 18:32:41 -0400 Mime-Version: 1.0 Message-Id: In-Reply-To: <15089.47157.268005.262050@gargle.gargle.HOWL> In-Reply-To: <200105011445.KAA01117@localhost.localdomain> <3AEEDFFC.409D8271@redhat.com> <15086.60620.745722.345084@gargle.gargle.HOWL> <3AF025AE.511064F3@redhat.com> <3AF04648.73F5BFCE@cds.duke.edu> <3AF0483C.49C8CF90@redhat.com> <20010502230357.A9507@bug.ucw.cz> <15089.47157.268005.262050@gargle.gargle.HOWL> Date: Thu, 3 May 2001 15:32:29 -0700 To: Eric.Ayers@intec-telecom-systems.com From: Jonathan Lundell Subject: Re: Linux Cluster using shared scsi Cc: linux-kernel@vger.kernel.org, linux-scsi@vger.kernel.org Content-Type: text/plain; charset="us-ascii" ; format="flowed" Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org At 3:57 PM -0400 2001-05-03, Eric Z. Ayers wrote: >However distateful it sounds, there is precedent for the >behavior that Doug is proposing in commercial clustering >implementations. My recollection is that both Compaq TruCluster and >HP Service Guard have logic that will panic the kernel when a disk is >"stolen" from under a running service and there is a "network >partition" in the cluster. > >A network partition occurs when multiple machines in the cluster are >runnig, but the HA software agents on two nodes can't communicate via >the network to arbitrate which node should be the owner of the disk. There are also the more extreme STONITH and STOMITH [shoot the other node/machine in the head] required by some shared filesystems (eg GFS). http://linux-ha.org/stonith.html http://sistina.com/gfs/howtos/gfs_howto/STOMITH__IO_Fencing.html -- /Jonathan Lundell.